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Abstract

We report on the design, fabrication and performance of a matching integrated optical CDMA encoder-decoder pair based on holographic Bragg reflector technology. Simultaneous encoding/decoding operation of two multiple wavelength-hopping time-spreading codes was successfully demonstrated and shown to support two error-free OCDMA links at OC-24. A double-pass scheme was employed in the devices to enable the use of longer code length.

Figures (5)

The (1,2,3) and (1,3,5) codes in the (3,11) carrier-hopping prime code family and the respective matrix representation of the WHTS sequence. The horizontal and vertical numbers in the matrix represent the chip position and transmitting carrier.

(a) Schematic top view of the 1×2 integrated holographic OCDMA encoder. The optical path for generation of code (1,2,3) is shown as dashed lines. A broad-band HBR splits off a fraction of the exiting (1,2,3) code sequence and converts it to code (1, 3, 5) (dotted lines) by double passing of the HBR array. Dimensions in the drawing are not to scale. The inset shows the photograph of packaged device chip. (b) Schematic detailing parameters of the encoder’s input-output channel waveguide manifold and locations of the HBR centers of curvature. The chip size, containing a matched encoder/decoder pair (only the encoder is shown here), is about 5×33 mm2.